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cast: ensure real<->int or size reduction in trunc_cast

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This commit is contained in:
Danny Robson 2015-11-17 16:38:34 +11:00
parent cfb5e13c28
commit e05e049c69
1 changed files with 11 additions and 3 deletions
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12
cast.hpp
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@ -71,9 +71,17 @@ sign_cast (const U u)
/// assert if the value cannot be cast loslessly from U to T, else return the /// assert if the value cannot be cast loslessly from U to T, else return the
/// converted value.Note: this is only a debug-time check and is compiled out /// converted value.Note: this is only a debug-time check and is compiled out
/// in optimised builds. /// in optimised builds.
template <
template <typename T, typename U> typename T,
typename U
>
std::enable_if_t<
// either we're casting from real to integer
!std::is_floating_point<T>::value && std::is_floating_point<U>::value
// or we're reducing the size of the type
|| sizeof (T) < sizeof (U),
T T
>
trunc_cast (U u) trunc_cast (U u)
{ {
auto t = static_cast<T> (u); auto t = static_cast<T> (u);